lkml.org 
[lkml]   [2018]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2 2/5] usb: serial: f81534: add auto RTS direction support
Date
The F81532/534 had auto RTS direction support for RS485 mode.
We'll read it from internal Flash with address 0x2f01~0x2f04 for 4 ports.
There are 4 conditions below:
0: F81534_PORT_CONF_RS232.
1: F81534_PORT_CONF_RS485.
2: value error, default to F81534_PORT_CONF_RS232.
3: F81534_PORT_CONF_RS485_INVERT.

F81532/534 Clock register (offset +08h)

Bit0: UART Enable (always on)
Bit2-1: Clock source selector
00: 1.846MHz.
01: 18.46MHz.
10: 24MHz.
11: 14.77MHz.
Bit4: Auto direction(RTS) control (RTS pin Low when TX)
Bit5: Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
---
V2:
1: Read the configure data from flash and save it to shadow clock
register.

drivers/usb/serial/f81534.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 758ef0424164..8a778bc1d492 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -98,11 +98,16 @@

#define F81534_DEFAULT_BAUD_RATE 9600

+#define F81534_PORT_CONF_RS232 0
+#define F81534_PORT_CONF_RS485 BIT(0)
+#define F81534_PORT_CONF_RS485_INVERT (BIT(0) | BIT(1))
#define F81534_PORT_CONF_DISABLE_PORT BIT(3)
#define F81534_PORT_CONF_NOT_EXIST_PORT BIT(7)
#define F81534_PORT_UNAVAILABLE \
(F81534_PORT_CONF_DISABLE_PORT | F81534_PORT_CONF_NOT_EXIST_PORT)

+#define F81534_UART_MODE_MASK (BIT(0) | BIT(1))
+
#define F81534_1X_RXTRIGGER 0xc3
#define F81534_8X_RXTRIGGER 0xcf

@@ -115,6 +120,8 @@
* 01: 18.46MHz.
* 10: 24MHz.
* 11: 14.77MHz.
+ * Bit4: Auto direction(RTS) control (RTS pin Low when TX)
+ * Bit5: Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)
*/

#define F81534_UART_EN BIT(0)
@@ -123,6 +130,9 @@
#define F81534_CLK_24_MHZ (F81534_UART_EN | BIT(2))
#define F81534_CLK_14_77_MHZ (F81534_UART_EN | BIT(1) | BIT(2))

+#define F81534_CLK_RS485_MODE BIT(4)
+#define F81534_CLK_RS485_INVERT BIT(5)
+
static const struct usb_device_id f81534_id_table[] = {
{ USB_DEVICE(FINTEK_VENDOR_ID_1, FINTEK_DEVICE_ID) },
{ USB_DEVICE(FINTEK_VENDOR_ID_2, FINTEK_DEVICE_ID) },
@@ -517,7 +527,8 @@ static int f81534_set_port_config(struct usb_serial_port *port,
}

port_priv->baud_base = baudrate_table[idx];
- port_priv->shadow_clk = clock_table[idx];
+ port_priv->shadow_clk &= ~F81534_CLK_14_77_MHZ;
+ port_priv->shadow_clk |= clock_table[idx];

status = f81534_set_port_register(port, F81534_CLOCK_REG,
port_priv->shadow_clk);
@@ -1269,9 +1280,12 @@ static void f81534_lsr_worker(struct work_struct *work)

static int f81534_port_probe(struct usb_serial_port *port)
{
+ struct f81534_serial_private *serial_priv;
struct f81534_port_private *port_priv;
int ret;
+ u8 value;

+ serial_priv = usb_get_serial_data(port->serial);
port_priv = devm_kzalloc(&port->dev, sizeof(*port_priv), GFP_KERNEL);
if (!port_priv)
return -ENOMEM;
@@ -1303,6 +1317,24 @@ static int f81534_port_probe(struct usb_serial_port *port)
if (ret)
return ret;

+ value = serial_priv->conf_data[port_priv->phy_num];
+ switch (value & F81534_UART_MODE_MASK) {
+ case F81534_PORT_CONF_RS485_INVERT:
+ port_priv->shadow_clk = F81534_CLK_RS485_MODE |
+ F81534_CLK_RS485_INVERT;
+ dev_info(&port->dev, "RS485 invert mode.\n");
+ break;
+ case F81534_PORT_CONF_RS485:
+ port_priv->shadow_clk = F81534_CLK_RS485_MODE;
+ dev_info(&port->dev, "RS485 mode.\n");
+ break;
+
+ default:
+ case F81534_PORT_CONF_RS232:
+ dev_info(&port->dev, "RS232 mode.\n");
+ break;
+ }
+
return 0;
}

--
2.7.4
\
 
 \ /
  Last update: 2018-01-04 03:31    [W:0.092 / U:1.624 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site